feat: Add graph and singlestat, support old style grafana dashboard

[yufeiminds]

Improve Grafana importer.

New Charts

• Graph
• SingleStat

New Feature

• Compitable for the old-style Grafana dashboard

Test Cases

• PostgreSQL Database Dashboard (Old-style dashboard)

[guance-review-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yufeiminds

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [yufeiminds]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[guance-review-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yufeiminds

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [yufeiminds]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication